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Fix minor bug in XLogFileRead() that accidentally worked.

Cascading replication copied the incoming file into pg_xlog butdidn't set path correctly, so the first attempt to open file failedcausing it to loop around and look for file in pg_xlog. So theearlier coding worked, but accidentally rather than by design.Spotted by Fujii Masao, fix by Fujii Masao and Simon Riggs

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src/backend/access/transam
- xlog.c

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`‎src/backend/access/transam/xlog.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -2805,6 +2805,11 @@ XLogFileRead(XLogSegNo segno, int emode, TimeLineID tli,`
`2805`	`2805`	`errmsg("could not rename file \"%s\" to \"%s\": %m",`
`2806`	`2806`	`path,xlogfpath)));`
`2807`	`2807`
	`2808`	`+/*`
	`2809`	`+ * Set path to point at the new file in pg_xlog.`
	`2810`	`+ */`
	`2811`	`+strncpy(path,xlogfpath,MAXPGPATH);`
	`2812`	`+`
`2808`	`2813`	`/*`
`2809`	`2814`	`* If the existing segment was replaced, since walsenders might have`
`2810`	`2815`	`* it open, request them to reload a currently-open segment.`

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Commit8143a56

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`‎src/backend/access/transam/xlog.c‎`

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